High impact - arc track and weather resistant polymer insulator and composition including epoxidized castor oil
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United States of America Patent
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-
Jun 3, 1980
Grant Date -
N/A
app pub date -
Jul 17, 1978
filing date -
Jul 17, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An arc track resistant, high voltage, filled synthetic resin insulator is disclosed which exhibits a wide range of desirable qualities heretofore unobtainable with any single type of prior insulator. The insulator hereof unexpectedly gives excellent arc track and flame resistance, along with a flexibilized yet rugged construction having good weatherability properties. These qualities are achieved through use of a relatively critical selection of components and proportions which also facilitate cast construction of the insulators by giving a pourable, yet highly filled liquid casting composition during the fabrication stage. The insulators include critical quantities of hydrated alumina (from about 60 to 75% by weight) and a synthetic resin matrix having expoxidized castor oil (18 to 24% by weight) and a glycidyl rigidizer therein, along with a curing agent and accelerator.
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